The most comfortable time to visit Ulaanbaatar is from mid June to mid August. For walking, go from late May to mid September. Sunbathing weather is not what it offers.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
Sun is not what Ulaanbaatar is for: the Sunbathing rating tops out at 22, mostly because it is too cool. The clearest skies come in January, when the sky is typically 32% covered at midday (mostly clear).
The being outside season here runs from mid June to mid August. It peaks in mid July, at 75. The weakest stretch is from October to mid April, when it drops to 0, mostly because it is too cold.
For walking, go from late May to mid September. It peaks in mid August, at 76. Avoid November to mid March for this: it falls to 0, mostly because it is too cold.
For snow, go from November to early March. It peaks in late December, at 65. Avoid June to mid September for this: it falls to 0, mostly because it is too mild. Snow here is a proxy: cold enough for snow to hold, with precipitation likely. It is not measured snow depth.
The year, measured
The average temperature in Ulaanbaatar over the whole year is -1°C. July is the hottest month, with highs of about 23°C; January is the coldest, with lows of about -28°C. The rainy (wet) season in Ulaanbaatar runs from May to September, peaking in August with a 45% chance of rain on a given day. The dry season is October to April; January is the driest month, at 2%. Winds in Ulaanbaatar are highest in May, averaging 4.4 m/s (16 km/h), and lightest in January, at 1.7 m/s (6 km/h). The prevailing wind is from the W. The clearest skies in Ulaanbaatar come in January, when the sky is typically 29% covered; July is the cloudiest month, at 57%.
Month by month Ulaanbaatar climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | -18°C | -28°C | -23°C | 2% | 29% | 1.7 m/s | 0 | 0 | 0 |
| February | -12°C | -25°C | -18°C | 10% | 32% | 2.1 m/s | 0 | 0 | 0 |
| March | 0°C | -12°C | -7°C | 7% | 43% | 3.0 m/s | 0 | 0 | 4 |
| April | 9°C | -2°C | 1°C | 11% | 51% | 4.0 m/s | 3 | 0 | 24 |
| May | 16°C | 5°C | 9°C | 29% | 54% | 4.4 m/s | 23 | 1 | 54 |
| June | 21°C | 12°C | 16°C | 29% | 57% | 3.8 m/s | 54 | 9 | 67 |
| July | 23°C | 15°C | 20°C | 29% | 57% | 3.2 m/s | 74 | 19 | 61 |
| August | 20°C | 13°C | 17°C | 45% | 55% | 3.0 m/s | 65 | 7 | 73 |
| September | 16°C | 5°C | 11°C | 31% | 50% | 3.2 m/s | 30 | 1 | 63 |
| October | 6°C | -6°C | 0°C | 13% | 44% | 2.9 m/s | 0 | 0 | 18 |
| November | -7°C | -17°C | -12°C | 13% | 42% | 2.2 m/s | 0 | 0 | 1 |
| December | -16°C | -26°C | -21°C | 5% | 32% | 1.7 m/s | 0 | 0 | 0 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Ulaanbaatar weather by season
Year round, Ulaanbaatar has days of about -18°C at their warmest in January, its coolest month, and 23°C in July, its warmest; the coolest hours of the day run from -28°C to 15°C through the year, and the average temperature over the year is -1°C around the clock. Rain is most likely around August and least likely around January. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Ulaanbaatar weather in winterDecember to February
Winter in Ulaanbaatar has typical daily highs of about -16°C and lows of about -26°C, with a 6% chance of rain on a given day.
Ulaanbaatar weather in springMarch to May
Spring in Ulaanbaatar has typical daily highs of about 8°C and lows of about -3°C, with a 16% chance of rain on a given day.
Ulaanbaatar weather in summerJune to August
Summer in Ulaanbaatar has typical daily highs of about 22°C and lows of about 13°C, with a 34% chance of rain on a given day.
Ulaanbaatar weather in autumnSeptember to November
Autumn in Ulaanbaatar has typical daily highs of about 5°C and lows of about -6°C, with a 19% chance of rain on a given day.
When is the rainy season in Ulaanbaatar?
The rainy (wet) season in Ulaanbaatar runs from May to September, peaking in August with a 45% chance of rain on a given day. The dry season is October to April; January is the driest month, at 2%.
What time of year is Ulaanbaatar windiest?
Winds in Ulaanbaatar are highest in May, averaging 4.4 m/s (16 km/h), and lightest in January, at 1.7 m/s (6 km/h). The prevailing wind is from the W.
What is the average temperature in Ulaanbaatar year round?
The average temperature in Ulaanbaatar over the whole year is -1°C. July is the hottest month, with highs of about 23°C; January is the coldest, with lows of about -28°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.